Type-III Bifurcation to Chaos in Self-Oscillating States of Squid Giant Axons

Kazuro Shimokawa, Yoshiro Hanyu, Gen Matsumoto

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5 Citations (Scopus)


This paper describes detailed bifurcation characteristics of firing (time sequence of action potentials) observed in squid giant axons as a function of temperature. The firing is spontaneously induced when the axon is immersed in Ca-reduced ASW (Artificial seawater) without any electrical stimulation. The firing observed above a critical temperature (high-temperature phase firing) is periodic, while the one below the critical temperature (low-temperature) is aperiodic. Our present analysis on the firing shows that aperiodic firing is chaotic, and bifurcation from periodic oscillation to chaos occurs through the type-III intermittency. The type-III bifurcation to chaos should take place through some temperature-dependent properties of the axonal membrane in itself. One of the most probable candidates underlying chaos and bifurcation mechanisms in this experiment could be temperature-dependednt spatial interaction along the longitudinal direction of the squid giant axon.

Original languageEnglish
Pages (from-to)2534-2537
Number of pages4
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - 1998 Jul


  • Chaos
  • Self-oscillation
  • Spatial interaction
  • Squid giant axon
  • Type III intermittency

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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